He has an issue you need to have addressed. IMO - he is absolutely a bite risk. Obedience may not be adequate - I again suggest a consult with a behaviorist.He was very well socialized as a puppy. I am home with him all of the time. He actually goes to a kennel when I have to leave town and does wonderful there! Loves other dogs. You will find this interesting though....once when I picked him up from the kennel the husband was there when I arrived. The wife volunteers at the local shelter and was gone. Hershey was there with the husband doing fine. When I walked in the room to get him Hershey ran to my side sat to the side of me looked at the man barked and growled at him and acted like he does at home when someone new arrives!! The man was shocked! He said Hersh and him were having a fine time before I came. So....it is obviously ME! I'm just not sure what I am doing wrong.